Skip additional test if 'xenapi_apis' flag is False

In change I0ae3f7a81ca7b56f56871e61bcf196ca572ae6d6, we introduced the
'xenapi_apis' feature flag to disable tests for XenAPI-only APIs that
are scheduled to be removed. However, we missed one test from the skip.
Add that test now, with a new, better name to highlight its purpose. We
also correct a related docstring.

Change-Id: Ica872c31751a7e0edb310acdc4bf59baaf6dfc54
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
1 file changed